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Mr. Allen C. Sorenson - DMG <br /> Page 3 <br /> March 10, 1998 <br /> a. Evaluate hardness in the East Fork of the Eagle River and calculate whether the <br /> water released from the reservoir meets water quality standards based on mixed <br /> hardness. <br /> Data which reflects the hardness of the East Fork of the Eagle River has been <br /> compared to that of the Reservoir. The mean of the hardness values for the River <br /> and the Reservoir are listed in the following table. In reviewing the data you will note <br /> that the hardness of the two waters is similar. <br /> TABLE'! <br /> Hardness Values <br /> (Values in mg11) <br /> East Fork Eagle Eagle Park <br /> River Just Below Reservoir <br /> North Interceptor <br /> Maximum 163 143 <br /> Minimum 76 69 <br /> Mean 108 98 <br /> Median 104 96 <br /> A mass balance equation was used to determine what a possible mixed hardness <br /> could be based on the median of data. This resulted in a hardness of 97 mg/I. Table <br /> 2 lists the standards based on a hardness value of 104 mg/I and the mixed hardness <br /> value. A review of the data in the table shows that the quality of the Eagle Park <br /> Reservoir will not exceed standards based on a lower hardness. <br />